But over the next 15 years, on top of the current mineral reserve stock, 29 million tonnes of sand and gravel and 0.8 million tonnes of carstone is needed, and the quarries listed in the report will meet this demand. From Wordnik.com. Reference
The council is required to "identify and safeguard sufficient mineral re-sources" to maintain the annual average supply of nearly three million tonnes of sand and gravel and 0.2 million tonnes of carstone, a type of rock. From Wordnik.com. Reference
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